P590L连铸过程C、N化物析出行为  

Precipitation behavior of carbonitride in P590L steel in CC process

作　　者：黎建全 吴国荣[2] 孙彦辉 雷阳伟 周明佳 LI Jian-quan;WU Guo-rong;SUN Yan-hui;LEI Yang-wei;ZHOU Ming-jia(Panzhihua Steel and Vanadium Co.,Ltd.,Pangang Group,Panzhihua 617062,Sichuan,China;Automobile and Household Appliances Steels Division,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]攀钢集团攀枝花钢钒有限公司,四川攀枝花617062 [2]攀钢集团研究院有限公司汽车与家电钢技术研究所,四川攀枝花617000 [3]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《连铸》2021年第4期17-20,37,共5页Continuous Casting

摘　　要：为研究微合金钢连铸过程C、N化物析出行为,以P590L微合金钢铸坯为研究对象,通过用碳膜萃取复型方法从拉伸试样中萃取析出物,使用JEM2100透射电镜观察试样中的第二相析出物,系统检验分析了微合金元素Ti、Nb的析出行为规律,分析了温度对析出物数量和尺寸影响规律,以及析出物对热塑性的影响趋势。试验表明,1 100℃时出现少量70nm以上的方形TiN和Ti-Nb复合析出物,在1 100~1 000℃有Nb(C,N)析出,随着温度的降低析出物数量增加,尺寸减小而且更加弥散,热塑性随析出物数量的增加而降低。To investigate the precipitation behavior of carbonitride in microalloyed steel,the P590 L microalloyed steel slab was taken as the research steel grade.The precipitates were extracted from the tensile samples by carbon film extraction reconstruction method.The second phase precipitates were observed by JEM2100 transmission electron microscope.The precipitation behavior of micro-alloying elements Ti and Nb was systematically examined and analyzed.The influence of temperature on the quantity and size of precipitates and the influence trend of precipitates on thermoplastility were also analyzed.The results show that a small amount of square TiN and Ti-Nb compound precipitates above 70 nm appear at 1 100 ℃,and Nb(C,N)precipitates occur at 1 100~1 000 ℃.With the decrease of temperature,the number of precipitates increases,the size decreases and becomes more dispersed,and the thermoplasticity decreases with the increase of the number of precipitates.

关 键 词：微合金钢 析出物 C、N化物 第二相 析出温度 热塑性 

分 类 号：TF777[冶金工程—钢铁冶金]